Big EU Lenders See More Pain

LONDON—Just six months after issuing billions of euros of new stock to investors and raising hopes the European banking sector was on the mend, three big lenders in key euro-zone economies have been hit by a fresh wave of problems.

Germany's Commerzbank AG and Italy's Banca Monte dei Paschi di Siena SpA are scrambling to come up with billions of euros in new capital to comply with European regulations. That is raising the prospect they might need to go back to their beleaguered investors—or taxpayers—for fresh rounds of aid.

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Germany's Commerzbank AG and Italy's Banca Monte dei Paschi di Siena SpA are scrambling to come up with billions of euros in new capital to comply with European regulations. WSJ's Sara Schaefer Munoz and David Enrich have trawled the numbers.